Power Over Ethernet (POE) Controller, 60 V/2 mA, 300 kHz Switch/Clock, QFN-28

LT4276BHUFD#PBF - Power Over Ethernet (POE) Controller, 60 V/2 mA, 300 kHz Switch/Clock, QFN-28

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Product Overview

The LT4276BHUFD#PBF is an LTPoE++/PoE+/PoE powered device (PD) forward/flyback controller in 28 pin QFN package. This device is a pin to pin compatible family of IEEE 802.3 and LTPoE++ powered device (PD) controllers. It includes an isolated switching regulator controller capable of synchronous operation in both forward and flyback topologies with auxiliary power support. The LT4276B is a fully 802.3at compliant (25.5W type 2 (PoE+) PD) and no opto isolator required for flyback operation. The device supports both forward and flyback power supply topologies and can be configurable for a wide range of PoE applications. Auxiliary input voltage can be accurately sensed with a resistor divider connected to AUX pin. The LT4276B utilizes an external, low RDS (ON) N channel MOSFET for hot swap function which maximizes power delivery, efficiency, reduces heat dissipation and eases thermal design.
  • IEEE 802.3at/af compliant
  • Superior surge protection (100V absolute maximum)
  • Auxiliary power support as low as 9V
  • Maximum PD (powered device) power of 25.5W
  • External hot swap N channel MOSFET for lowest power dissipation and highest system efficiency
  • Greater than 94% end to end efficiency with LT4321 ideal bridge
  • Vin operating voltage is 60V (VPORT, HSSRC)
  • Switching frequency of 300KHz at ROSC = 45.3Kohm to GND
  • Maximum PG duty cycle is 66%
  • Operating junction temperature range from -40°C to 125°C


Power Management, Security, Wireless, Imaging, Video & Vision

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